2017 Honda Ridgeline. The Honda Ridgeline is a unique pickup that employs car-like unibody construction in place of the rugged but unrefined body-on-frame setup that underpins its competitors. As a result, the Ridgeline provides a more comfortable ride and better handling than most pickups while still offering decent towing and hauling capabilities.
The flatness tolerance references two parallel planes (parallel to the surface that it is called out on) that define a zone where the entire reference surface must lie. Flatness tolerance is always less than the dimensional tolerance associated with it. Tolerance Zone: Two Sets of Parallel Planes where the entire referenced surface must lie. Gauging / Measurement: Flatness is can be measured using a height gauge run across the surface of the part if only the reference feature is held parallel.
Re: Mill Tolerance. Mill tolerance is the deviation allowed to a pipe manufacturer from the actual nominal thickness of a pipe. 1) This has been considered by relevant pipes ASTM standards, ASME B31 codes, and ASME B36.10 due to incapability of any mill to produce a pipe with an exact nominal thickness defined. The value in all the mentioned standards has been set to 12.5% of nominal thickness. 2) Both positive or negative mill tolerances can exist in a pipe. Positive would not be causing any significant impact but negative may put you in an odd situation if you didn't consider mill tolerance during piping thickness calculation.